add blacklisted domain id->categories mapping

README.md

@@ -252,6 +252,11 @@ RedPajama-V2 is an open dataset for training large language models and includes
 | minhash_signature_0.9                          | Banded minhash signature of the document, for fuzzy deduplication at Jaccard similarity 0.9. The signature is based on 128 hash functions and grouped into 5 bands and 25 rows for LSH..                                                                                                                                                                                                                             | Deduplication    |
 | minhash_signature_1.0                          | Banded minhash signature of the document, for fuzzy deduplication at Jaccard similarity 1.0. The signature is based on 128 hash functions and grouped into 1 band and 128 rows for LSH.                                                                                                                                                                                                                              | Deduplication    |
 
+
+The quality signal `rps_doc_ut1_blacklist` is given by a categorical id indicating the combination of UT1 blacklisted 
+domain categories the domain of the document belongs to. The mapping `id -> [category_1, ..., category_k]` is given in
+`ut1_domain_categories.json`. It can also be downloaded from this [link](https://data.together.xyz/redpajama-data-v2/v1.0.0/artifacts/ut1_domain_categories.json).
+
 #### Raw Document and Token Counts (`head_middle`)
 
 |       | # Documents (deduped) | Estimated Token count (deduped) |